As they were walking uphill back to their hostel, Ms O'Loughlin noticed that Ms Orsi was panting and her face was flushed.

CLINIC

The next day, when Ms Orsi did not show up for breakfast, Ms O'riordan went to check on her and found her lying on her back.

Ms O'riordan and two friends took Ms Orsi to a nearby clinic.

There, nurses gave Ms Orsi oxygen and placed her on an IV drip.

As there was a lack of personnel and equipment there, the women decided to transfer her to a hospital.

Insp Chia told State Coroner Marvin Bay: "Along the journey, Emma noticed (Ms Orsi) exhibiting stroke symptoms... as if she was having a seizure."

A doctor suggested that they take her to Siloam Hospital to receive neurological treatment.

On the way there, Ms Orsi vomited twice.

At Siloam Hospital, a CT scan revealed that her brain had swelled. By then, she was fully unconscious.

Her family members were contacted and they arrived on Feb 22.

Ms Orsi was air-evacuated to Singapore two days later and was immediately put on mechanical ventilation when she reached SGH in the wee hours of Feb 25.

She died a week later.

A Sunday Times report on March 8 stated that her organs, including her kidneys, skin and corneas were donated.

Her father, Mr Dennis Orsi, had said: "From when she was young, she had been an advocate of organ donation. We have an opt-in system (in Northern Ireland) and she said that if anything bad happened, it would be her wish."

In her autopsy report, consultant forensic pathologist Dr Marian Wang said that Ms Orsi's final cause of death was hypoxic ischaemic encephalopathy, or brain damage caused by lack of oxygen and blood flow to the brain.

"While the exact cause of (Ms Orsi's) initial collapse cannot be determined, there is evidence to suggest that her death resulted from the lack or adequate supply of oxygen to the brain and the absence of timely medical care and attention," said Insp Chia.

Coroner Bay will deliver his findings on Sept 22.

About Mount Bromo

Indonesia's Mount Bromo is one of the most visited tourist attractions in East Java.

The crater of the active volcano is about 2,329m above sea level. It last erupted in 2010, paralysing the tourism industry as hotels were forced to close due to the thick ash.

Mount Bromo is named after Brahma, the Hindu god of creation.

To reach there, visitors typically fly to Surabaya before travelling for about four hours by car.